JP2012202162A - Bridge crane, bridge erection method and bridge removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge crane capable of minimizing necessity of traffic regulation when erecting a precast girder and then easily executing transfer work to the next erection span.SOLUTION: When erecting a precast girder 14 to an erection span S0, by a bridge crane 110 installed on an upper surface of a bridge pier 12A, in the state of hoisting and supporting the precast girder 14 through a girder hoisting nose 50, it is hoisted and moved to an erection scheduled position in a bridge axis orthogonal direction. At the time, a second leg 140 of the bridge crane 110 comprises a pair of movable legs 140A and 140B. Then, when a hoisting device 150 is moved in the bridge axis orthogonal direction and passes through installation parts of the respective movable legs 140A and 140B, the respective movable legs 140A and 140B are successively moved to an interference evading position at which it is possible to evade interference with the girder hoisting nose 50 hoisted and supported by the hoisting device 150. Thus, the girder hoisting nose 50 is prevented from interfering with both of the movable legs 140A and 140B.

Description

  The present invention relates to a bridge-type crane that is used in the state of being installed on the upper surface of a bridge pier when a girder is erected or removed, and to a bridge erection method and a bridge removal method using the crane.

  Conventionally, as a method of erection of bridges such as multi-span continuous bridges, a plurality of girders are erected at a predetermined interval in the direction perpendicular to the bridge axis between a pair of bridge piers located on both sides of the bridge axis between the installation diameters. The method is known.

  As such erection methods, each girder was directly erected using a mobile crane, or installed so as to straddle the support works and bridge piers installed in the carry-in yard located on the side between the erection diameters. A method of erection using a one-leg overhang type bridge crane is common.

  On the other hand, in “Patent Document 1”, a bridge erection in which a girder for installation extending in the bridge axis direction is installed so as to straddle the erection diameter, and the girder is suspended and supported by the girder for erection, and the bridge is installed. A method is described.

  At that time, in the bridge erection method described in “Patent Document 1”, it is possible to move in the longitudinal direction with respect to a horizontal rail that extends in a direction perpendicular to the bridge axis and is installed on the upper surface of each pair of bridge piers. The installation girder is installed in this manner, and with this installation girder, a plurality of girders are sequentially lifted at the side end positions between the installation diameters, and moved to the planned installation position in the direction perpendicular to the bridge axis and suspended. ing.

JP 2009-68249 A

  In the construction method using a mobile crane, the construction span is occupied by the mobile crane during the construction work, and in the bridge construction method using a one-foot overhang type bridge crane, the support yard is installed in the carry-in yard. Since it is installed, there is a problem that it is necessary to regulate traffic for a long time when there is an existing road between the spans.

  Furthermore, in the construction method using a mobile crane, since the mobile crane itself is large, it is necessary to perform ground maintenance and ground improvement over a wide range of construction spans, and the construction work can be performed efficiently. There is also the problem that it is not possible.

  On the other hand, if the girder is taken with the girder suspended and supported by the girder for erection as in the bridge erection method described in the above-mentioned “Patent Document 1,” the span between the erection spans and the carry-in yard becomes heavy machinery or erection. Since it will not be occupied for a long time by the equipment, even if there is an existing road between the spans, it is possible to minimize the need for traffic regulation. However, even when such a bridge erection method is adopted, there is a problem that it is necessary to use a crane that is large to some extent when the erection girder is moved between the erection diameters.

  On the other hand, a bridge crane is installed on the upper surface of each pair of bridge piers located on both sides in the bridge axis direction between the spans, and a girder is installed between the two bridge piers using the pair of bridge cranes. If possible, each of these bridge cranes is lighter than the above girder girder, and it is not necessary to install a side rail. Therefore, it is possible to easily perform the relocation work between the next spans. Become.

  However, simply installing a normal bridge crane on the upper surface of each pier has the following problems.

  That is, in general, a bridge crane is configured to support a crane girder in which a suspension device is movably installed by a first leg and a second leg, and the suspension device suspends a load almost directly below the crane girder. It comes to support.

  For this reason, when a girder is installed using a bridge crane installed on the upper surface of a bridge pier, a girder nose (that is, projecting in the longitudinal direction from the longitudinal end of the girder at the longitudinal end of the girder) It is necessary to suspend and support the girder almost directly under the crane girder through this girder nose. However, in this case, when the suspension device moves in the direction perpendicular to the bridge axis, there is a problem that the girder nose suspended and supported by the suspension device interferes with the second leg (or the first leg). is there.

  On the other hand, in the case of using a bridge crane installed on the upper surface of the pier, if it is configured to directly suspend and support the longitudinal end of the girder at a position shifted from the position directly below the crane girder to the span span, The problem of interference no longer arises. However, in such a case, a large overturning moment is generated in the bridge crane, so it is necessary to use a large bridge crane to prevent this, and the relocation work between the next installation spans There is a problem that it becomes impossible to take advantage of the advantage of the bridge crane that can be easily performed.

  Such a problem may occur not only when a girder is installed between a pair of piers but also when the girder is removed.

  The present invention has been made in view of such circumstances, and the transfer work between the next installation spans is performed after minimizing the necessity of traffic regulation when installing or removing the girders. It is an object of the present invention to provide a bridge crane that can be easily performed, and to provide a bridge erection method and a bridge removal method using the bridge crane.

  The present invention is intended to achieve the above object by adopting a bridge-type crane used in a state of being installed on the upper surface of a pier, and by devising the configuration.

That is, the bridge crane according to the present invention is
When installing a girder between a pair of bridge piers located on both sides in the bridge axis direction between spans, or when removing a girder built between the pair of bridge piers, A bridge crane used in the state installed on the upper surface of
A crane girder extending in the direction orthogonal to the bridge axis, a first leg and a second leg that support the crane girder at a predetermined interval in the direction orthogonal to the bridge axis, and movably installed in the direction orthogonal to the bridge axis with respect to the crane girder And a suspension device configured to be able to suspend and support the girder via a girder hanging nose attached to the longitudinal end of the girder,
The second leg is composed of a pair of movable legs installed at a predetermined interval in the direction orthogonal to the bridge axis,
These movable legs can avoid interference with the girder nose suspended and supported by the suspension device when the suspension device moves in the direction perpendicular to the bridge axis and passes through the installation location of the movable leg. It is comprised so that it can move to a position, It is characterized by the above-mentioned.

  The “girder” constructed (or removed) between the pair of piers may be a single girder or a plurality of girder. Moreover, the kind of this "girder" is not specifically limited, For example, a precast girder, a steel girder, etc. are employable.

  The above-described “lifting device” is not particularly limited as long as it is installed so as to be movable in the direction orthogonal to the bridge axis with respect to the crane girder. .

  The installation distance of the above-mentioned “one pair of movable legs” is, in particular, a specific value if a size that does not interfere with any of the movable legs is secured when the girder nose is positioned between the two movable legs. It is not limited.

  As long as each of the “movable legs” is configured to be able to move to the interference avoidance position, the specific configuration for that purpose is not particularly limited. Therefore, it is possible to adopt a configuration that moves to the interference avoidance position, or a configuration in which all or part of the movable leg expands and contracts to move to the interference avoidance position.

Next, a bridge erection method according to the present invention uses a bridge crane according to the present invention to construct a girder carried in a carry-in yard located on the side between the erection diameters between the pair of piers. A way to
The bridge crane is installed on the upper surface of the bridge pier with the crane girder extending to a position above the carry-in yard and the second leg positioned on the carry-in yard side with respect to the first leg. After
After the lifting device lifts the girders to be erected into the carry-in yard to a height where the girder hanging nose is located above the upper surface of the bridge pier, the hoisting device is moved to the planned erection position of the girders. After moving in the direction perpendicular to the bridge axis, suspend the girder on the pier, so that the girder is installed,
At that time, the suspension device starts to move in the direction perpendicular to the bridge axis in a state where the movable leg located on the opposite side of the first leg is moved to the interference avoidance position. When moving to a position between the pair of movable legs, the movable leg located on the opposite side of the first leg is moved to the original position, and then the movable leg located on the first leg side is interfered with. The suspension device is moved to an avoidance position, and then the suspension device is moved to the planned installation position.

On the other hand, the method for removing a bridge according to the present invention uses the bridge crane according to the present invention to remove a girder installed between the pair of bridge piers to a carry-out yard located on the side between the installed diameters. A method,
The bridge crane is installed on the upper surface of the bridge pier with the crane girder extending to a position above the carry-out yard and the second leg positioned on the carry-out yard side with respect to the first leg. After
After lifting the girders to be removed between the pair of bridge piers by the lifting device, the lifting device is moved in the direction perpendicular to the bridge axis to the upper position of the unloading yard, and then the girders are moved. The above girder is removed by suspending it to the planned removal position of the carry-out yard.
At that time, the suspension device is moved in the direction perpendicular to the bridge axis in a state where the movable leg located on the first leg side is moved to the interference avoidance position, and then the suspension device is moved to the pair of pairs. When moving to the position between the movable legs, the movable leg located on the first leg side is moved to the original position, and then the movable leg located on the side opposite to the first leg is moved to the interference avoidance position. It is made to move, and the said suspension apparatus is moved to the upper position of the said unloading yard after that.

  As shown in the above configuration, the bridge crane according to the present invention is used in a state where it is installed on the upper surface of the bridge pier. Therefore, even in the case where an existing road exists between the spans, The need for traffic regulation during installation or removal can be minimized.

  Further, the bridge crane according to the present invention is used in such a state that it is installed on the upper surface of the bridge pier, but with the suspension device, the beam suspension nose attached to the longitudinal end of the beam is used. Therefore, the nose suspension nose can be supported almost directly below the crane girder. For this reason, it is possible to prevent an overturning moment from being generated in the bridge crane, thereby eliminating the need to use a large bridge crane.

  In addition, the bridge crane according to the present invention is composed of a pair of movable legs whose second legs are installed at a predetermined interval in the direction orthogonal to the bridge axis, and each of these movable legs, When the suspension device moves in the direction perpendicular to the bridge axis and passes through the installation position of the movable leg, the suspension device can move to an interference avoidance position that can avoid interference with the girder nose suspended and supported by the suspension device. Therefore, the following effects can be obtained.

  That is, when the suspension device moves in the direction perpendicular to the bridge axis even though the suspension device is configured to support and support the girder nose almost directly below the crane girder, the movement of the suspension crane moves Accordingly, by sequentially moving the movable legs to the interference avoidance position, the suspension nose can be moved to a predetermined position without interfering with any of the movable legs. Therefore, even if the bridge crane is not enlarged, the expected function can be exhibited when the girder is installed or removed. This eliminates the need to use a large crane to move the bridge crane between the next spans.

  As described above, according to the present invention, it is possible to easily perform the transfer work of the bridge crane between the next installation diameters while minimizing the necessity of traffic regulation when installing or removing the girders. it can. In addition, since the relocation work of the bridge crane can be easily performed in this way, the traffic regulation time at the time of the relocation can be minimized.

  In the above configuration, if the movable legs are moved to the interference avoidance position by a rotational motion, the movement can be performed by a simple operation.

  At that time, the movement of the movable leg located on the opposite side of the first leg to the interference avoidance position of the pair of movable legs turns to the opposite side of the first leg with its upper end as a fulcrum. And the movement of the movable leg located on the first leg side to the interference avoidance position is performed by a rotational movement toward the first leg with its upper end as a fulcrum. Can be moved most easily, and the vertical space for passing the nose suspension nose can be secured to the maximum.

  By the way, when the bridge erection method according to the present invention is adopted when the girder carried in the carry-in yard located on the side between the erection diameters is erected between the pair of bridge piers, the following effects are obtained. Can be obtained.

  That is, in the bridge erection method according to the present invention, the bridge crane is in a state in which the crane girder extends to the upper position of the carry-in yard and the second leg is located on the carry-in yard side with respect to the first leg. After installing it on the upper surface of the pier, the suspension device lifts the girder loaded into the loading yard to a height where the nose suspension nose is positioned above the upper surface of the pier, and then installs the suspension device The girders are installed by moving them in the direction perpendicular to the bridge axis to the planned position, and then hanging the girders on the piers. The girder construction work can be started simply by performing the attachment work and the suspension support work by the suspension device. Therefore, even when there is an existing road between the spans, it is sufficient to temporarily restrict traffic when carrying the girders into the carry-in yard, thereby minimizing the traffic restriction time.

  In addition, in the bridge erection method according to the present invention, the movement of the suspension device in the direction orthogonal to the bridge axis is started with the movable leg located on the side opposite to the first leg moved to the interference avoidance position. Thereafter, when the suspension device moves to a position between the pair of movable legs, the movable leg located on the side opposite to the first leg is moved to the original position and then the movable leg located on the first leg side is moved. Since the leg is moved to the interference avoidance position and then the suspension device is moved to the planned installation position, the girder nose can be moved to the planned installation position without interfering with any movable legs, Thereby, the girder can be installed smoothly.

  On the other hand, when the girder constructed between a pair of bridge piers is removed to the carry-out yard located on the side between the installation spans, if the bridge removing method according to the present invention is employed, the following operational effects are obtained. be able to.

  That is, in the bridge removing method according to the present invention, the bridge crane is configured such that the crane girder extends to a position above the carry-out yard and the second leg is located on the carry-out yard side with respect to the first leg. After installing on the upper surface of the pier, lift the girders to be removed between the pair of piers with a suspension device, and then move the suspension device to the upper position of the carry-out yard in the direction perpendicular to the bridge axis. Since the girders are removed by suspending the girders to the planned removal position of the carry-out yard, the removal work of the nose suspension nose is removed from the girders suspended to the planned removal position of the carry-out yard. And the removal work of the girder can be completed only by removing the lifting device. Therefore, even when there is an existing road between the installation diameters, it is only necessary to temporarily restrict traffic when carrying a girder from the carry-out yard, and thus the traffic restriction time can be minimized.

  Then, in the bridge removal method according to the present invention, the movement of the suspension device in the direction orthogonal to the bridge axis is started with the movable leg located on the first leg side moved to the interference avoidance position, and then When the suspension device moves to a position between the pair of movable legs, the movable leg located on the first leg side is moved to the original position, and then the movable leg located on the opposite side of the first leg interferes. Since it is moved to the avoidance position and then the lifting device is moved to the upper position of the carry-out yard, the girder nose can be moved to the planned removal position without interfering with any movable legs. The girder can be removed smoothly.

The side view which shows the outline | summary of the bridge construction method which concerns on one Embodiment of this invention Detailed view of part II in Fig. 1 Sectional view taken along line III-III in FIG. Process drawing showing the bridge erection method according to the above embodiment Process drawing which shows the bridge removal method which concerns on one Embodiment of this invention The figure similar to FIG. 2 which shows the bridge crane which concerns on the modification of the said embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, a bridge construction method according to an embodiment of the present invention will be described.

  FIG. 1 is a side view showing an outline of a bridge erection method according to the present embodiment. 2 is a detailed view of a portion II in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

  As shown in these drawings, the application target of the bridge erection method according to the present embodiment is a portion of the span S0 in the multi-span continuous bridge. At this time, the span S0 is the span S0 of the portion constituting the rampway of the highway, and between the pair of bridge piers 12A and 12B located on both sides in the bridge axis direction. Three precast girders 14 are constructed at predetermined intervals in the direction perpendicular to the bridge axis.

  Then, in the bridge erection method according to the present embodiment, as shown in FIG. 3, the precast girder 14 to be erected in the carry-in yard Yi located on the side of the erection span S0 is lifted, and this precast is performed. Girder 14 is constructed in order between a pair of bridge piers 12A and 12B. In FIG. 3, for each of the three precast girders 14, the respective planned installation positions are indicated by two-dot chain lines.

  As shown in FIG. 1, in the span span S-1 adjacent to the pier 12B side with respect to the span span S0, the three precast girders 14 have been erected, and adjacent to the pier 12A side. In the construction span S + 1, construction is performed next to the construction span S0.

  As shown in FIG. 1, L-shaped girder receiving portions 12Aa and 12Ba are formed at the upper ends of the piers 12A and 12B, respectively, while the opposite ends of each precast girder 14 in the longitudinal direction are reversed. An L-shaped recess 14a is formed. The precast girders 14 are placed on the girder receiving portions 12Aa and 12Ba of the piers 12A and 12B in the concave portions 14a.

  In the present embodiment, a bridge crane 110 is installed on the upper surface of each of the pair of bridge piers 12A, 12B, and each precast girder 14 is installed using the pair of bridge cranes 110. ing. At that time, girder hanging noses 50 projecting in the longitudinal direction are respectively attached to both ends in the longitudinal direction of the precast girder 14, and the precast girder 14 is connected to the double-bridge crane 110 via the pair of girder hanging noses 50. It is designed to be supported by hanging.

  Each girder hanging nose 50 has a configuration in which a pair of H-section steels 52 are arranged at predetermined intervals in a direction perpendicular to the bridge axis. These girder hanging noses 50 are arranged so as to extend in the bridge axis direction in the vicinity of the upper surface of the precast girder 14 and at positions separated from the longitudinal end of the precast girder 14 by a predetermined distance from the longitudinal end. Is fixed to the precast beam 14. At that time, the fixing at the longitudinal end portion of the precast beam 14 of each girder hanging nose 50 is performed with the supporting steel material 54 interposed between the H-shaped steel 52 and the precast beam 14, and the lower end portion of the precast beam 14. A pair of left and right steel rods 56 embedded in the steel plate 56 is used, and the fixing at a position away from the longitudinal end portion by a predetermined distance is supported between both the H-shaped steel 52 and the precast beam 14. This is done by tensioning a pair of left and right steel rods 62 whose lower ends are embedded in the precast girders 14 with the steel material 58 interposed and the support steel material 60 disposed on the upper surfaces of both H-shaped steels 52.

  These girder hanging noses 50 are bridge-type cranes at positions slightly deviated from the center position in the longitudinal direction to the other end (that is, the end opposite to the end where the support steel material 54 is installed). 110 is supported by suspension. A counterweight 64 is placed on the upper surface of the other end of each girder nose 50.

  Each of the pair of bridge cranes 110 has the same configuration. Therefore, in the following, the configuration of the bridge crane 110 installed on the upper surface of one pier 12A will be described in detail.

  As shown in FIGS. 2 and 3, the bridge crane 110 includes a crane girder 120 extending in a direction orthogonal to the bridge axis, and a first leg 130 and a second leg that support the crane girder 120 at a predetermined interval in the bridge axis orthogonal direction. The leg 140 and the suspension device 150 installed so as to be movable in the direction orthogonal to the bridge axis with respect to the crane girder 120 are provided.

  The crane girder 120 connects a pair of H-sections 120A extending in the direction orthogonal to the bridge axis at a predetermined interval in the direction of the bridge axis and the H-sections 120A at four locations in the direction orthogonal to the bridge axis and both H-shapes. It is comprised with the connection steel material 120B arrange | positioned so that it may protrude in the bridge-axis direction both sides rather than steel 120A. And the rail 122 for moving the suspension apparatus 150 to a bridge axis orthogonal direction is each installed in the upper surface of each H-section steel 120A.

  The first leg 130 has a vertical member 130A whose upper end is rigidly connected to a portion in the vicinity of one end of the crane girder 120 in the direction perpendicular to the bridge axis, and whose upper end is rigidly connected to one end of the crane girder 120 in the direction perpendicular to the bridge axis. In addition, the lower end portion is composed of a diagonal member 130B rigidly connected to the lower end portion of the vertical member 130A.

  The first leg 130 has a configuration in which a pair of vertical members 130A and diagonal members 130B are arranged at predetermined intervals in the bridge axis direction. At that time, the pair of vertical members 130A are connected to each other by a plurality of connecting steel members (not shown). Further, the upper end portion of each vertical member 130A and the upper end portion of each diagonal member 130B are rigidly connected to the crane girder 120 on the lower surfaces of the front end portion and the rear end portion of the connecting steel member 120B of the crane girder 120, respectively.

  When the first leg 130 is installed on the upper surface of the pier 12A, the hinge member 132 is attached to the lower end portion of the vertical member 130A and the upper surface of the pier 12A is provided with adjustment concrete 160 via the adjustment concrete 160. It is placed and is further fixed to the pier 12A by an anchor or the like (not shown).

  The second leg 140 is a pair of movable legs 140A installed at a predetermined interval in the bridge axis orthogonal direction at a position somewhat away from the other end part of the crane girder 120 in the bridge axis orthogonal direction. 140B. At this time, the installation interval between the pair of movable legs 140A and 140B is set to a value slightly larger than the width of the beam suspension nose 50 in the direction perpendicular to the bridge axis. Of the pair of movable legs 140A and 140B, the movable leg 140B positioned on the first leg 130 side is made of a steel material having a larger cross-sectional shape than the other movable leg 140A and the first leg 130. .

  The movable leg 140A is configured to be able to rotate about 90 ° to the opposite side of the first leg 130 with the upper end as a fulcrum, and the movable leg 140B is on the first leg 130 side with the upper end as a fulcrum. It is configured to be able to rotate about 90 °.

  In the movable leg 140A, a pair of vertical members 140A1 arranged at a predetermined interval in the bridge axis direction are arranged by connecting steel members 140A2 arranged in three upper and lower positions and extending to extend in the bridge axis direction. It is the structure connected by one pair of connection steel materials 140A3. In order to realize the above-mentioned rotation, the movable leg 140A has upper ends of the pair of vertical members 140A1 connected to the front end and the rear end of the connecting steel member 120B of the crane girder 120 via the hinge member 142A. Connected to the bottom surface.

  The movable leg 140B also includes a connecting steel material (not shown) and a pair of vertical members 140B1 arranged at a predetermined interval in the bridge axis direction and arranged in three places above and below so as to extend in the bridge axis direction. It is the structure connected by one pair of connection steel materials (not shown) arrange | positioned by. In order to realize the above-mentioned rotation, the movable leg 140B has an upper end portion of the pair of vertical members 140B1 connected to the front end portion and the rear end portion of the connecting steel member 120B of the crane girder 120 via the hinge member 142B. Connected to the bottom surface.

  When these movable legs 140A and 140B are installed on the upper surface of the pier 12A, the hydraulic jacks 144A and 144B are attached to the lower ends of the vertical members 140A1 and 140B1, and the movable legs 140A and 140B are attached to the upper surface of the pier 12A. It is placed via the adjusting concrete 160.

  The suspension device 150 is installed so as to straddle a pair of H-section steel members 120 </ b> A constituting the crane girder 120.

  At this time, the suspension device 150 is provided with respect to the crane girder 120 at two locations in the bridge axis direction on the lower surface of the upper steel material 152 and an upper steel material 152 extending in the bridge axis direction to both sides in the bridge axis direction than the connecting steel material 120B. A pair of electric chain blocks 156 suspended from and supported by both ends of the upper steel member 152 in the direction of the bridge axis, and both ends of the pair of electric chain blocks 156 being supported by the pair of electric chain blocks 156. And a lower steel material 158 extending in the bridge axis direction.

  The suspension device 150 suspends and supports the girder nose 50 via a connecting steel material 170 extending in the vertical direction at the center of the lower steel material 158 in the bridge axis direction. At this time, the connecting steel material 170 is connected to the girder nose 50 in a state where the lower end portion is inserted between the pair of H-shaped steels 52, thereby the girder nose. The total width of 50 is not made larger than the total width of the pair of H-section steels 52.

  The suspension device 150 is configured to lift and suspend the girder nose 50 by the pair of electric chain blocks 156.

  Further, the suspension device 150 has a pair of rolling mechanisms 154 mounted on a pair of rails 122 in the crane girder 120 so that the suspension device 150 can move in a direction perpendicular to the bridge axis. This movement is performed by operating the tow rope 180 having both ends attached to the upper steel material 152 of the suspension device 150 and the fixture 124 installed on the upper surface of one end of the crane girder 120. .

When the bridge crane 110 according to the present embodiment is installed on the upper surface of the pier 12A, when the suspension device 150 moves in the direction orthogonal to the bridge axis and passes through the installation locations of the movable legs 140A and 140B, Each of these movable legs 140A, 140B is configured to be able to move to an interference avoidance position that can avoid interference with the girder nose 50 that is suspended and supported by the suspension device 150.
At this time, the movable legs 140A and 140B are configured to move to the interference avoidance position by a rotating motion. Specifically, of the pair of movable legs 140A and 140B, the movable leg 140A located on the opposite side of the first leg 130 moves to the interference avoidance position with the upper end of the movable leg 140A as a fulcrum. The movement of the movable leg 140B located on the first leg 130 side to the interference avoidance position is performed by turning the upper end of the movable leg 140B as a fulcrum. The first leg 130 is rotated by a movement toward the first leg 130 side.

  Next, a bridge construction method using the bridge crane 110 according to the present embodiment will be described with reference to FIG.

  First, as shown in FIG. 4A, the bridge girder 110 is extended from the upper surface of the pier 12A (and 12B) to the upper position of the carry-in yard Yi, and the second leg 140 is It installs in the state located in the carrying-in yard Yi side with respect to the 1st leg 130. FIG.

  Next, as shown in FIG. 5A, the precast girder 14 to be installed, which is carried into the carry-in yard Yi by a trailer or the like, is shown in FIG. Further, the girder hanging nose 50 is lifted up to a height located above the upper surface of the pier 12A (and 12B).

  Thereafter, the suspension device 150 is moved in the direction perpendicular to the bridge axis to the position where the precast girder 14 is to be erected as shown in FIGS. 150, the precast girder 14 is hung on the pier 12A.

  Thereafter, the three precast girders 14 are installed by repeating this.

  At that time, before the precast girder 14 is lifted (or after it is lifted), the movable leg 140A located on the side opposite to the first leg 130 is moved to the interference avoidance position, as shown in FIG. . And as shown in the figure (b), the movement to the bridge axis orthogonal direction of the suspension apparatus 150 is started in the state which moved the movable leg 140A to the interference avoidance position. Thereafter, as shown in FIG. 5C, when the suspension device 150 moves to a position between the pair of movable legs 140A and 140B, the movable leg 140A is moved to the original position, and As shown in d), the movable leg 140B located on the first leg 130 side is moved to the interference avoidance position, and in this state, the suspension device 150 is moved to the planned installation position as shown in FIG. .

  Next, the operation of this embodiment will be described.

  In the bridge erection method according to the present embodiment, both piers 12A and 12B are provided with the bridge crane 110 installed on the upper surface of each of the pair of piers 12A and 12B located on both sides of the bridge span direction S0 in the bridge axis direction. Since three precast girders 14 are installed at a predetermined interval in the direction perpendicular to the bridge axis between each other, even in the case where an existing road exists in the span span S0, The necessity of traffic regulation when erection can be minimized.

  Moreover, in the bridge construction method according to the present embodiment, the bridge crane 110 is used in a state where it is installed on the upper surface of each of the pair of piers 12A, 12B. Since the crane 110 is configured to suspend and support the precast beam 14 via the beam hanging nose 50 attached to the longitudinal end portion of the precast beam 14 by the suspension device 150, the crane girder 120 is an abbreviation of the crane girder 120. The nose suspension nose 50 can be supported directly below. For this reason, it is possible to prevent a tipping moment from occurring in the bridge crane 110, thereby eliminating the need to use a large bridge crane 110.

  In addition, the bridge crane 110 according to the present embodiment includes a pair of movable legs 140A and 140B in which the second leg 140 is installed at a predetermined interval in the bridge axis orthogonal direction, and These movable legs 140A and 140B interfere with the girder nose 50 suspended and supported by the suspension device 150 when the suspension device 150 moves in the direction perpendicular to the bridge axis and passes through the installation location of the movable legs 140A and 140B. Therefore, the following operation and effect can be obtained.

  In other words, the suspension crane 150 moves in the direction orthogonal to the bridge axis even though the suspension device 150 is configured to suspend and support the girder suspension nose 50 almost directly below the crane girder 120. In this case, the movable leg 140A, 140B is sequentially moved to the interference avoidance position along with the movement, so that the girder nose 50 can be moved to a predetermined position without interfering with any of the movable legs 140A, 140B. .

  Therefore, even if the bridge crane 110 is not enlarged, the expected function can be exhibited when the precast girder 14 is installed. This eliminates the need to use a large crane to move the bridge crane 110 to the next span S + 1.

  As described above, according to the present embodiment, it is possible to easily move the bridge crane 110 to the next spanning span S + 1 while minimizing the necessity of traffic regulation when the precast girder 14 is erected. It can be carried out. Further, since the transfer work of the bridge crane 110 can be easily performed in this way, the traffic regulation time at the time of the transfer can be minimized.

  In particular, in the present embodiment, of the pair of movable legs 140A and 140B, the movable leg 140B positioned on the first leg 130 side is a steel material having a larger cross-sectional shape than the other movable leg 140A and the first leg 130. Since it is configured, the crane structure can sufficiently withstand the load acting on the bridge crane 110 when the precast girder 14 is installed, and the weight can be sufficiently reduced.

  Moreover, in the present embodiment, since the movable legs 140A and 140B are moved to the interference avoidance position by a rotational movement, the movement can be performed by a simple operation.

  At that time, of the pair of movable legs 140A and 140B, the movement of the movable leg 140A located on the opposite side of the first leg 130 to the interference avoidance position is opposite to that of the first leg 130 having the upper end as a fulcrum. The movable leg 140B located on the first leg 130 side is moved to the interference avoidance position by the pivoting movement toward the first leg 130 with its upper end as a fulcrum. Since it is configured, it is possible to move to the interference avoidance position without any difficulty, and it is possible to secure a maximum vertical space for allowing the girder nose 50 to pass therethrough.

  And in the bridge construction method concerning this embodiment, the precast girder 14 carried in the carrying-in yard Yi located in the side of construction span S0 is constructed between a pair of bridge piers 12A and 12B. At this time, on the upper surface of each bridge pier 12A, 12B, the bridge girder 110 projects the crane girder 120 to a position above the carry-in yard Yi, and the second leg 140 is located on the carry-in yard Yi side with respect to the first leg 130. After being installed in a state, the suspension device 150 lifts the precast girder 14 to be installed carried into the carry-in yard Yi to a height where the girder nose 50 is positioned above the upper surfaces of the piers 12A and 12B. After the device 150 is moved in the direction perpendicular to the bridge axis to the position where the precast girder 14 is to be installed, the precast girder 14 is moved to the pier 12A. Since the precast girder 14 is constructed by being suspended on 12B, the girder nose 50 is attached to the precast girder 14 carried into the carry-in yard Yi and supported by the suspension device 150. The construction work of the precast girder 14 can be started only by performing the work. Therefore, even when there is an existing road in the span span S0, it is sufficient to temporarily restrict traffic when carrying the girders into the carry-in yard Yi, and thus the traffic regulation time can be minimized.

  In addition, in the bridge erection method according to the present embodiment, the movement of the suspension device 150 in the direction perpendicular to the bridge axis is performed by moving the movable leg 140A located on the opposite side of the first leg 130 to the interference avoidance position. After that, when the suspension device 150 moves to a position between the pair of movable legs 140A and 140B, the movable leg 140A located on the side opposite to the first leg 130 is moved to the original position. Then, the movable leg 140B located on the first leg 130 side is moved to the interference avoidance position, and then the suspension device 150 is moved to the planned installation position, so that the girder nose 50 can be moved to any movable leg 140A. , 140B can be moved to the planned installation position without interfering with each other, whereby the precast girder 14 can be installed smoothly.

  Next, a bridge removing method according to an embodiment of the present invention will be described.

  FIG. 5 is a process diagram showing a bridge removing method according to the present embodiment.

  As shown in the figure, in the bridge removing method according to the present embodiment, the three precast girders 14 are sequentially removed from the existing bridge using the bridge crane 110 in a procedure substantially opposite to the bridge erection method. It is supposed to be.

  In the following, for the convenience of explanation, a process of removing the precast girder 14 that is finally removed from among the three precast girders 14 installed in the span span S0 will be described.

  First, before removing, the floor slab 16 arranged on the upper surface of the existing three precast girders 14 is divided into three for each precast girders 14 as shown by a two-dot chain line in FIG. deep.

  And as shown to the same figure (a), while the crane girder 120 overhangs the bridge crane 110 in the upper surface of the pier 12A (and 12B) to the upper position of the carrying-out yard Yo, the 2nd leg 140 is The first leg 130 is installed in a state of being located on the unloading yard Yo side.

  Next, as shown in FIG. 6A, the precast girder 14 to be removed (that is, the precast girder 14 to be removed last) is slightly removed from the pier 12A together with a part of the floor slab 16 arranged on the upper surface thereof. Suspend to.

  Thereafter, as shown in FIGS. 5B to 5E, the suspension device 150 is moved in the direction perpendicular to the bridge axis to the upper position of the unloading yard Yo, and then the precast girder 14 is removed by the suspending device 150 from the unloading yard Yo. Suspend to the planned position. Then, the precast girder 14 is unloaded from the unloading yard Yo by a trailer or the like.

  At that time, before the precast girder 14 is lifted (or after it is lifted), the movable leg 140B located on the first leg 130 side is moved to the interference avoidance position, as shown in FIG. And as shown in the figure (b), the movement to the bridge axis orthogonal direction of the suspension apparatus 150 is started in the state which moved the movable leg 140B to the interference avoidance position. Thereafter, as shown in FIG. 5C, when the suspension device 150 moves to a position between the pair of movable legs 140A and 140B, the movable leg 140B is moved to the original position, and As shown in d), the movable leg 140A located on the opposite side of the first leg 130 is moved to the interference avoidance position. And as shown in the figure (e), after moving the suspending apparatus 150 to the upper position of the carrying-out yard Yo, the precast girder 14 is suspended to the removal planned position.

  The other two precast girders 14 can be removed by the same process as described above.

  Next, the operation of this embodiment will be described.

  In the bridge removing method according to the present embodiment, when the existing precast girder 14 is removed to the carry-out yard Yo located on the side of the span span S0, the bridge crane 110 is formed on the upper surface of each pier 12A (and 12B). Is installed in a state where the crane girder 120 extends to the upper position of the unloading yard Yo and the second leg 140 is positioned on the unloading yard Yo side with respect to the first leg 130, and is then removed by the suspension device 150. After the precast girder 14 is lifted, the lifting device 150 is moved in the direction perpendicular to the bridge axis to the position above the carry-out yard Yo, and then the precast girder 14 is suspended to the planned removal position of the carry-out yard Yo. Since it is designed to be removed, the precast girder 14 is suspended to the planned removal position of the unloading yard Yo. Against, it is possible to complete the dismantling of the precast girder 14 by simply performing the removing work of detaching and lifting device 150 digit hanging nose 50. Therefore, even in the case where an existing road exists in the span between spans S0, it is sufficient to temporarily restrict traffic when carrying a girder from the carry-out yard Yo, so that the traffic regulation time can be minimized.

  Then, in the bridge removing method according to the present embodiment, the movement of the suspension device 150 in the direction orthogonal to the bridge axis is started with the movable leg 140B located on the first leg 130 side moved to the interference avoidance position. Thereafter, when the suspension device 150 moves to a position between the pair of movable legs 140A and 140B, the movable leg 140B located on the first leg 130 side is moved to the original position and then the first leg 130 is moved. Since the movable leg 140A located on the opposite side to the position is moved to the interference avoidance position, and then the suspension device 150 is moved to a position above the carry-out yard Yo, the girder nose 50 can be moved to any movable leg 140A. , 140B can be moved to the planned removal position without interfering with each other, whereby the precast girder 14 can be removed smoothly.

  In the above embodiment, the case where the application object of the bridge erection method and the bridge removal method is a part where three precast girders 14 are arranged between the erection diameters such as a rampway of an expressway has been described. However, it is also possible to apply a portion where four or more precast girders 14 are arranged, such as a highway main line.

  Also, when a single bridge girder is installed between the installation diameters or when a single bridge girder installed between the installation diameters is removed, the bridge installation method or the bridge removal method according to the above embodiment may be adopted. Is possible.

  Next, a modified example of the bridge crane 110 according to the above embodiment will be described.

  FIG. 6 is a view similar to FIG. 2 showing a bridge crane 210 according to this modification.

  As shown in the figure, the basic configuration of the bridge crane 210 is the same as that of the bridge crane 110 according to the above embodiment, but is more simplified than the bridge crane 110. ing.

  That is, in the bridge crane 210, the suspension device 250 has a single electric chain block 256. Further, in the crane girder 220 of the bridge crane 210, a connecting steel material 220 </ b> B that connects a pair of H-section steels 220 </ b> A extending in the bridge axis orthogonal direction at a plurality of locations in the bridge axis orthogonal direction surrounds the suspension device 250. It is an arranged configuration.

  Of the pair of movable legs constituting the second leg 240 of the bridge crane 210, the movable leg 240A corresponding to the movable leg 140A of the above embodiment is a pair of H-section steels constituting the crane girder 220. A pair of vertical members 240A1 whose upper ends are connected to the lower end surface of 220A via a hinge member 242A, and a pair of members extending obliquely in the bridge axis direction so that the upper ends are rigidly connected to the vertical members 240A The diagonal member 240A2 is composed of a pair of connecting steel members 240A3 that connect the lower end portions of the diagonal members 240A2 and the lower end portions of the vertical members 240A1.

  The other movable leg (that is, the movable leg corresponding to the movable leg 140B in the above embodiment) has the same configuration as that of the movable leg 240A except that the vertical material has a larger cross-sectional shape than the vertical material 240A1. It has become.

  Even in the case of adopting the configuration of the present modification, it is possible to obtain the same operational effects as in the case of the above embodiment.

  Further, in the bridge crane 210 according to this modification, since a single electric chain block 256 is used, the cost can be reduced as much as the bridge crane 110 according to the above embodiment.

  In addition, the numerical value shown as a specification in the said embodiment and modification is only an example, and of course, you may set these to a different value suitably.

12A, 12B Bridge pier 12Aa, 12Ba Girder receiving part 14 Precast girder 14a Recess 16 Floor slab 50 Girder hanging nose 52, 120A, 220A H-shaped steel 54, 58, 60 Support steel 56, 62 Steel bar 64 Counter weight 110, 210 Bridge type Crane 120, 220 Crane girder 120B, 140A2, 140A3, 170, 220B, 240A3 Connecting steel material 122 Rail 124 Fixing tool 130 First leg 130A, 140A1, 140B1, 240A1 Vertical material 130B, 240A2 Diagonal material 132, 142A, 142B, 242A Hinge Member 140, 240 Second leg 140A, 140B, 240A Movable leg 144A, 144B Hydraulic jack 150, 250 Lifting device 152 Upper steel 154 Rolling mechanism 156, 256 Electric chain blow Click 158 lower steel 160 adjusts concrete 180 tow S0, S-1, S + 1 bridging span Yi loading yard Yo out Yards

Claims (5)

When installing a girder between a pair of bridge piers located on both sides in the bridge axis direction between spans, or when removing a girder built between the pair of bridge piers, A bridge crane used in the state installed on the upper surface of
A crane girder extending in the direction orthogonal to the bridge axis, a first leg and a second leg that support the crane girder at a predetermined interval in the direction orthogonal to the bridge axis, and movably installed in the direction orthogonal to the bridge axis with respect to the crane girder And a suspension device configured to be able to suspend and support the girder via a girder hanging nose attached to the longitudinal end of the girder,
The second leg is composed of a pair of movable legs installed at a predetermined interval in the direction orthogonal to the bridge axis,
These movable legs can avoid interference with the girder nose suspended and supported by the suspension device when the suspension device moves in the direction perpendicular to the bridge axis and passes through the installation location of the movable leg. A bridge crane characterized by being configured to move to a position.   The bridge crane according to claim 1, wherein each movable leg is moved to the interference avoidance position by a rotational motion.   Of the pair of movable legs, the movement of the movable leg located on the opposite side of the first leg to the interference avoidance position moves to the opposite side of the first leg with the upper end of the movable leg as a fulcrum. The movement of the movable leg located on the first leg side to the interference avoidance position is performed by the pivoting movement toward the first leg with the upper end of the movable leg as a fulcrum. The bridge crane according to claim 2, wherein the bridge crane is configured as described above. A bridge crane according to any one of claims 1 to 3, wherein a girder carried into a carry-in yard located on the side between the erection diameters is installed between the pair of bridge piers,
The bridge crane is installed on the upper surface of the bridge pier with the crane girder extending to a position above the carry-in yard and the second leg positioned on the carry-in yard side with respect to the first leg. After
After the lifting device lifts the girders to be erected into the carry-in yard to a height where the girder hanging nose is located above the upper surface of the bridge pier, the hoisting device is moved to the planned erection position of the girders. After moving in the direction perpendicular to the bridge axis, suspend the girder on the pier, so that the girder is installed,
At that time, the suspension device starts to move in the direction perpendicular to the bridge axis in a state where the movable leg located on the opposite side of the first leg is moved to the interference avoidance position. When moving to a position between the pair of movable legs, the movable leg located on the opposite side of the first leg is moved to the original position, and then the movable leg located on the first leg side is interfered with. A bridge construction method, wherein the bridge is moved to an avoidance position, and then the suspension device is moved to the planned construction position. Using the bridge crane according to any one of claims 1 to 3, a method of removing a girder constructed between the pair of bridge piers to a carry-out yard located on a side between the constructed diameters,
The bridge crane is installed on the upper surface of the bridge pier with the crane girder extending to a position above the carry-out yard and the second leg positioned on the carry-out yard side with respect to the first leg. After
After lifting the girders to be removed between the pair of bridge piers by the lifting device, the lifting device is moved in the direction perpendicular to the bridge axis to the upper position of the unloading yard, and then the girders are moved. The above girder is removed by suspending it to the planned removal position of the carry-out yard.
At that time, the suspension device is moved in the direction perpendicular to the bridge axis in a state where the movable leg located on the first leg side is moved to the interference avoidance position, and then the suspension device is moved to the pair of pairs. When moving to the position between the movable legs, the movable leg located on the first leg side is moved to the original position, and then the movable leg located on the side opposite to the first leg is moved to the interference avoidance position. A method for removing a bridge, comprising: moving the suspension device to a position above the carry-out yard.

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